diff --git a/src/blackmisc/propertyindex.cpp b/src/blackmisc/propertyindex.cpp
index 6ca4cd8ec..e3a4ef945 100644
--- a/src/blackmisc/propertyindex.cpp
+++ b/src/blackmisc/propertyindex.cpp
@@ -8,140 +8,121 @@
  */
 
 #include "blackmisc/propertyindex.h"
-
+#include "blackmisc/verify.h"
 #include <QStringList>
 #include <QtGlobal>
 
 namespace BlackMisc
 {
-    CPropertyIndex::CPropertyIndex(int singleProperty)
+    CPropertyIndex::CPropertyIndex(int singleProperty) : m_indexes { singleProperty }
     {
         Q_ASSERT(singleProperty >= static_cast<int>(GlobalIndexCValueObject));
-        this->setIndexStringByList({singleProperty});
     }
 
-    CPropertyIndex::CPropertyIndex(std::initializer_list<int> il)
-    {
-        this->setIndexStringByList(il);
-    }
+    CPropertyIndex::CPropertyIndex(std::initializer_list<int> il) : m_indexes(il)
+    {}
 
-    CPropertyIndex::CPropertyIndex(const QList<int> &indexes)
-    {
-        this->setIndexStringByList(indexes);
-    }
+    CPropertyIndex::CPropertyIndex(const QVector<int> &indexes) : m_indexes(indexes)
+    {}
 
-    CPropertyIndex::CPropertyIndex(const QString &indexes) : m_indexString(indexes)
+    CPropertyIndex::CPropertyIndex(const QList<int> &indexes) : m_indexes(indexes.toVector())
+    {}
+
+    CPropertyIndex::CPropertyIndex(const QString &indexes)
     {
         this->parseFromString(indexes);
     }
 
     CPropertyIndex CPropertyIndex::copyFrontRemoved() const
     {
-        Q_ASSERT_X(!this->isEmpty(), Q_FUNC_INFO, "Empty index");
+        BLACK_VERIFY_X(!this->isEmpty(), Q_FUNC_INFO, "Empty index");
         if (this->isEmpty()) { return CPropertyIndex(); }
-        const int p = this->m_indexString.indexOf(';');
-        if (p < 0) { return CPropertyIndex(); }
-        return CPropertyIndex(this->m_indexString.mid(p + 1));
+        CPropertyIndex copy = *this;
+        copy.m_indexes.pop_front();
+        return copy;
     }
 
     bool CPropertyIndex::isNested() const
     {
-        return this->m_indexString.contains(';');
+        return m_indexes.size() > 1;
     }
 
     bool CPropertyIndex::isMyself() const
     {
-        return this->m_indexString.isEmpty();
+        return m_indexes.isEmpty();
     }
 
     bool CPropertyIndex::isEmpty() const
     {
-        return this->m_indexString.isEmpty();
+        return m_indexes.isEmpty();
     }
 
     QString CPropertyIndex::convertToQString(bool i18n) const
     {
         Q_UNUSED(i18n);
-        return this->m_indexString;
+        QString s;
+        for (const int i : m_indexes)
+        {
+            Q_ASSERT(i >= static_cast<int>(GlobalIndexCValueObject));
+            if (!s.isEmpty()) { s.append(";"); }
+            s.append(QString::number(i));
+        }
+        return s;
     }
 
     void CPropertyIndex::parseFromString(const QString &indexes)
     {
-        if (indexes.isEmpty())
-        {
-            this->m_indexString.clear();
-        }
-        else
-        {
-            QString is(indexes.simplified().replace(" ", ";").replace(",", ";"));
-            if (is.endsWith(';'))
-            {
-                this->m_indexString = is.left(is.length() - 1);
-            }
-            else
-            {
-                this->m_indexString = is;
-            }
-        }
-    }
-
-    void CPropertyIndex::setIndexStringByList(const QList<int> &list)
-    {
-        QString l;
-        for (const int &i : list)
-        {
-            Q_ASSERT(i >= static_cast<int>(GlobalIndexCValueObject));
-            if (!l.isEmpty()) { l.append(";"); }
-            l.append(QString::number(i));
-        }
-        this->m_indexString = l;
-    }
-
-    QList<int> CPropertyIndex::indexList() const
-    {
-        QList<int> list;
-        if (this->m_indexString.isEmpty()) { return list; }
-        QStringList indexes = this->m_indexString.split(';');
-        for (const QString &index : indexes)
+        m_indexes.clear();
+        if (indexes.isEmpty()) { return; }
+        for (const QString &index : indexes.split(';'))
         {
             if (index.isEmpty()) { continue; }
             bool ok;
             int i = index.toInt(&ok);
             Q_ASSERT(ok);
             Q_ASSERT(i >= static_cast<int>(GlobalIndexCValueObject));
-            list.append(i);
+            m_indexes.append(i);
         }
-        return list;
+    }
+
+    QJsonObject CPropertyIndex::toJson() const
+    {
+        QJsonObject json;
+        json.insert(QStringLiteral("indexes"), this->convertToQString());
+        return json;
+    }
+
+    void CPropertyIndex::convertFromJson(const QJsonObject &json)
+    {
+        const QJsonValue value = json.value(QLatin1String("indexes"));
+        if (!value.isString()) { throw CJsonException("'indexes' missing or not a string"); }
+        this->parseFromString(value.toString());
+    }
+
+    QVector<int> CPropertyIndex::indexVector() const
+    {
+        return m_indexes;
+    }
+
+    QList<int> CPropertyIndex::indexList() const
+    {
+        return m_indexes.toList();
     }
 
     void CPropertyIndex::prepend(int newLeftIndex)
     {
-        QList<int> newList = indexList();
-        newList.prepend(newLeftIndex);
-        this->setIndexStringByList(newList);
+        m_indexes.push_front(newLeftIndex);
     }
 
     bool CPropertyIndex::contains(int index) const
     {
-        return this->indexList().contains(index);
+        return m_indexes.contains(index);
     }
 
     int CPropertyIndex::frontToInt() const
     {
         Q_ASSERT_X(!this->isEmpty(), Q_FUNC_INFO, "No index");
-        int f = -1;
-        bool ok;
-        const int p = this->m_indexString.indexOf(';');
-        if (p < 0)
-        {
-            f = this->m_indexString.toInt(&ok);
-        }
-        else
-        {
-            f = this->m_indexString.leftRef(p).toInt(&ok);
-        }
-        Q_ASSERT_X(ok && f >= 0, Q_FUNC_INFO, "Invalid index");
-        return f;
+        return m_indexes.front();
     }
 
     bool CPropertyIndex::startsWith(int index) const
diff --git a/src/blackmisc/propertyindex.h b/src/blackmisc/propertyindex.h
index bf1babbcf..45fb63ff5 100644
--- a/src/blackmisc/propertyindex.h
+++ b/src/blackmisc/propertyindex.h
@@ -63,7 +63,7 @@ namespace BlackMisc
         public Mixin::MetaType<CPropertyIndex>,
         public Mixin::HashByMetaClass<CPropertyIndex>,
         public Mixin::DBusByMetaClass<CPropertyIndex>,
-        public Mixin::JsonByMetaClass<CPropertyIndex>,
+        public Mixin::JsonOperators<CPropertyIndex>,
         public Mixin::EqualsByMetaClass<CPropertyIndex>,
         public Mixin::LessThanByMetaClass<CPropertyIndex>,
         public Mixin::CompareByMetaClass<CPropertyIndex>,
@@ -170,7 +170,10 @@ namespace BlackMisc
         //! Initializer list constructor
         CPropertyIndex(std::initializer_list<int> il);
 
-        //! Construct from a base class object.
+        //! Construct from a vector of indexes.
+        CPropertyIndex(const QVector<int> &indexes);
+
+        //! Construct from a list of indexes.
         CPropertyIndex(const QList<int> &indexes);
 
         //! From string
@@ -188,6 +191,9 @@ namespace BlackMisc
         //! Empty?
         bool isEmpty() const;
 
+        //! Index vector
+        QVector<int> indexVector() const;
+
         //! Index list
         QList<int> indexList() const;
 
@@ -237,19 +243,22 @@ namespace BlackMisc
         //! \copydoc BlackMisc::Mixin::String::toQString
         QString convertToQString(bool i18n = false) const;
 
+        //! \copydoc BlackMisc::CValueObject::toJson
+        QJsonObject toJson() const;
+
+        //! \copydoc BlackMisc::CValueObject::convertFromJson
+        void convertFromJson(const QJsonObject &json);
+
     protected:
         //! Parse indexes from string
         void parseFromString(const QString &indexes);
 
     private:
-        QString m_indexString; //! I use a little trick here, the string is used with the tupel system, as it provides all operators, hash ..
-
-        //! Convert list to string
-        void setIndexStringByList(const QList<int> &list);
+        QVector<int> m_indexes;
 
         BLACK_METACLASS(
             CPropertyIndex,
-            BLACK_METAMEMBER(indexString)
+            BLACK_METAMEMBER(indexes)
         );
     };
 } //namespace